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Principle of system leakage detection
Jun 18 , 2020
Most technicians are very familiar with the GFCI sensor for ground fault current detection.The detection principle is as follows: In a three-phase system, a chip-type RCMU (leakage current monitoring unit) is placed on the bus. The most important thing is that all three buses pass through the middle hole of the RCMU randomly. The illustrated system does not have a neutral line and is a three-phase...
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Principle and Application of Hall-effect current sensor
Aug 06 , 2020
The power factor correction (PFC) circuit and inverter circuit in the telecom rectifier and server power supply unit (PSU) all need to detect the current signal on the high-voltage side to the controller on the low-voltage side, so an isolated current sensor is used. There are many ways to implement isolated current detection, such as current transformers (CT), isolation amplifiers, and Hall effec...
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Error analysis and calculation of current transformer
Aug 06 , 2020
First of all, the current transformer is an instrument and equipment that converts a large current into a small current on the secondary side according to the principle of electromagnetic induction. The current transformer is composed of a closed iron core and windings. Its primary winding has very few turns and is stringed in the path of the current that must be measured. Then today I will give y...
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Realization of current detection in automobile electronic system
Aug 12 , 2020
Here mainly introduces the detection method of electric current, find some factors that are easy to be neglected in the design. First consider two different methods: the detection method based on the magnetic field and the detection method based on the shunt. 1. Magnetic field-based detection methods (represented by current transformers and Hall sensors) have many advantages, such as good isolatio...
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You can understand these simple voltage transformer common sense
Sep 17 , 2020
Regarding voltage transformers, in fact, many people don’t know about it. Although voltage transformers have always been near your friends and serve your daily lives, then the following is about voltage transformers. Detailed description. 1. The working principle of voltage transformer is introduced in detail The number of the voltage transformer is P.T, and the working principle of the voltage tr...
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Is there any need for a current transformer?
Aug 12 , 2021
The safe operation and management of transformers is the key to everyone’s daily work. Based on the experience exchanges on the analysis of abnormal operation conditions and common problems of transformers, it will be helpful to immediately and accurately distinguish the causes and characteristics of common faults, and take immediate measures to ensure The safe operation of machinery and equipment...
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Analysis of Magnetization Curve of Ferrite Core for Transformer
Jun 18 , 2022
Ferrite is a material that is relatively cheap in magnetic materials, and has good magnetic permeability and magnetic saturation strength, so it is now used in many current transformers, and in open-close current transformers, it is often based on customers. Therefore, we choose ferrites of different materials, such as PC40 and high-conductivity ferrite. We know that PC40 has a certain magnetic pe...
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Current transformer selection points
Jul 19 , 2022
Current transformer selection points: (1) The rated frequency of the current transformer should be consistent with the current frequency of the line under test. (2) Select the rated voltage of the current transformer according to the voltage level of the line under test to ensure the safety of the staff and the instrument. Never use a current transformer with a lower rated voltage to measure line ...
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